Rotary pump



, Patented May 26, 1925.

UNITED STATES PATENT ()FFICE.

WILLIA B. ENSIGN, or new YORK, N. Y., ASSIGN'OR TO LLOYD v. REYNOLDS, or

- NEW YORK, N. Y.

ROTARY PUMP.

Application filed February 23, 1924. Serial N'o.'634,738.

T all whom it may concern? Be it known that I, VVILLIAM B. ENSIGN', a citizen of the United States, and a resident of the city of New York, borough of the 6 Bronx, in the county of Bronx and State of New York, have invented a new and Improved Rotary Pump, of which the following is a full, clear, and exact description.

This invention relates to pumps adapted to pump fluids of difierent kinds, as for instance, air and gas, and has vfor an ob ect to provide an improved construction where- 'in a comparatively high speed may be used and at the same time a maximum compression secured.

Another object of the invention is to provide a pump wherein the parts are so arranged that a minimum wearing action is produced while securing a maximum pumping action.

A still further object of the invention is to provide a pump in which the blades are held in position by centrifugal action at one point and by fluid matter at another point.

An additional object is to provide a rotary pump with an automatically adjusting end .to take care of wear and expansion produced by heat.

In the accompanying drawing- Figure 1 is a longitudinal vertical seclional view through a rotary pump, disclosing an embodiment of the invention.

Figure 2 is a sectional view through Fig ure 1, approximately on line 22.

Referring to the accompanying drawing by numerals, 1 indicates a casing which is provided with a bore2 circular in cross section and adapted to receive a cylindrical piston 3 offset from the center eccentrically. As the piston 3 is appreciably smaller than the bore 2, it is positioned so as to contact at one point withthe casing 1 and at its diametrically opposite point be spaced therefrom a certain distance. The pump may be, of course, of any desired length.

In pumps of this kind, the question of expansion sometimes is aggravating and in order to take care of any expansion caused by heat or any difference in length of the piston 3 caused by wear, a movable end 4 is provided for the casing 1. The end 4 is provided with piston rings 5 for providing a tight peripheral connection and is bored as accurate as possible to rovide a snug fit on the shaft 6. The shaft 18 keyed'or otherwise associated with end 4 and spaced therefrom, said outside end being bolted or otherwise rigidly secured to the casin 1. Siuitable springs 8 act on the end 7 an the end. 4 for resiliently pressing the end 4 against the end of the piston 3.

It is, of course, evident that the pump could be made with-a fixed or stationary end as well as the yielding end 4 if desired. The ends 4 and 9 are each provided with a radially positioned groove 10 positioned near the point where the piston 3 contacts with the casing 1 and on the compression side thereof, whereby upon the compression of any fluid by any of the blades 11, a certain amount will be forced into the respective grooves 10 and into the respective arc-shaped grooves-12. The piston 3 is provided with the usual radial slots 18 for accommodating the blades 11 and as these blades are not keyed to the piston 3. An outside end 7 is I provided with springs, pins or other means for holding the same in an outer position, there is, therefore, a vacant space in back of each of these blades into which gas from the grooves 10 and 12 passes as the slots 13 pass the grooves. It will be noted that the grooves 10, together with their grooves 12, are positioned so that the space in back of each blade will come into registry with the grooves 12 at the time the blade approaches its maximum compression. The gas or other fluid acting in the slots 13 against the blades 11 forces said blades outwardly with a pressure proportionate to the compression. This compression continues past the outlet pipe 14 until the blades reach the inlet opening 15. From this point on until gas is again admitted in back of the blades, centrifugal action will hold the blades out against the walls of the cylinder 1. From the point 16 to approximately the point 17, there is very little compression if any and, consequently, the centrifugal action on the blades will hold the blades sufliciently tigh ainst the walls of the casing 1 to force the fluid around toward the compression point and as the compression increases, gas is admitted in back of the blades for producing a. proper contact. It will thus be seen that the blades are automatically adjusted to the walls of the cylinder during all periods of wear and are held against the cylinder tightly only at the points where they are to hold the compression or for some other purpose.

In order that the blades may have a good contact with the casing 1, each blade is provided with a packing strip 18 arranged to one side of a central line, drawn to the blade, the various acking strips being offset in a direction 0 rotation whereby at the point of compression there is little or no inward thrust to the blades adjacent the p'ackings while at the point where the cylinder 3 touches the casing 1, achamber is provided in back of the packing strips for taking care or any small quantity of fluid which attempts to s p ston at this point. The pocket formed as indicated at 19, not only acts to take care of fluid in the way of gas or air care of oil collected near this oint and produces a relief therefor whereby there is no knocking between the blades and the casing. It will thus be seen that as the piston 3 rotates, even though it rotates at a very high.

speed, there is no undesirable radial outward pressure on the blades and there is only an appreciable outward pressure on the blades at the various points needed. Gas, air or other liquid passing from the pipe 20 will enter the inlet 15 and will be forced around by the respective blades to the diametrically opposite side while the fluid is compressed and forced out the pipe 14 and a small quantity on each revolut on is forced into the grooves 10 and 12. a

The packing'lS may be of any desired kind, as for instance, a suitable metal or suitable vulcanized water-proof fiber which has a good wearing quality. a

What I claim is: i

'1. A. rotary pump for pumping fluids, comprising a casing, a rotary piston of less diameter than the bore of the casing eccentrically positioned in said casing so that at one point it contacts with the casing, a plurality a blade arranged in each of said slots, said casing having an arc-shaped groove at each end positioned to be uncovered by said slots queeze in between the casing and but also takes of radial slots arranged in the piston,

as they groove extending from the first mentioned rooves to the walls of the casing, said raial grooves being positioned in communication with the compression side of the pump whereby fluid under compression will be acting on certain of the blades for urging them outwardly in a direct ratio to the compression in the compression chamber.

2. A rotary pump for pumping fluids, comprising a casin a rotary piston of less diameter than the lime of the casing eccentrically positioned in said casing so that at one point it contacts with the casing, a plurality of radial slots arranged in the piston, a blade arranged in each of said slots, said casing having a groove at each end positioned to be uncovered by said slots as they move past, a radially arranged groove extending from the first mentioned grooves to the walls of the casing, sitioned in communication with the compression side of the pump whereby fluid under compression will be acting on certain of the blades for urging a direct ratio to the compression in the compression chamber.

them outwardly in 3. A rotary pump comprising a casin arotary piston of less diameter than the bore of the casing eccentrically positioned in said casing so that at one point it contacts with the casing, a plu rality of radial slots arranged in the pi? ton, a blade arranged in each of said slots, said casing having a groove at each end positioned to be in communication with said slots, a radially arranged groove extending from the first mentioned grooves to the walls of the casing, said radial grooves being positioned in communication with the compression side of the pump whereby fluid un der compression will be acting on the blades for urging them outwardly in a direct ratio to the compression WILLIAM B. nu'sreu.

in the compression chamber.

move past, a radially arranged said radial grooves being po 0 for pumping fluids, 

